Alone at last, he looked sadly through the pages of David's notebook, at the tantalizing curls and angles of the Coptic letters, cryptic symbols of a discovery which prevented a man from growing old. Well, no one could read them now. That secret was dead, along with its discoverer, because, in this world, no study was permitted without a practical end in view. And perhaps it was just as well. Could any man be trusted, he wondered, to deal wisely with a power so great? After closing the notebook, he dropped his head into his hands. How his head ached! He felt cold, suddenly, and his whole body began to shake with a hard chill. He lifted his head, his vision blurred, and suddenly he knew. He had Blue Martian fever! Teeth chattering, he paced wildly about the room, puzzling things out, trying to remember. That booster shot! And then he realized the amazing truth: David Wong had given him a chance! He had inoculated him with the seeds of immortality, giving him a chance to help right the wrongs of this Categorized world. And now he was left alone in a world of mortals. David and the others had been annihilated, and he was left to live on and on, alone. He staggered toward his private apartments, then sank into his chair as his secretary once again ran into the room. With a supreme effort he controlled his trembling. "Yes?" "Leader Lanza. Another report." "Just a minute," said Lanza, trying to bring his eyes into focus on the excited girl. "I am in need of a rest. As soon as you have gone, I shall retire into seclusion for a few days. There are to be no interruptions. Is that clear? Now, proceed." "There's a new epidemic of Martian Fever reported where one never was before." He stirred tiredly. "Where now?" "South America. Somewhere in the Andes." "I think we'll have just one Category after this," said Lanza dreamily. "Category Phoenix." "What did you say, Leader?" His thoughts wandered. No wonder Magnun's men found no bodies. The planes they shot down were roboplanes, after all, and it was easy to plant in an empty seat a man's wristwatch and his bulky leather pencil case. David and the others were safe now. They were free and had enough time to plan for the new free world. "What did you say, Leader?" the girl repeated, bewildered. "Nothing. It doesn't matter." He frowned painfully, and then shrugged. "On second thought, I may be away longer than a week. If anyone asks for me, say I'm on an Aimless Tramp. I've always hoped that some day I might earn the right to a Free Choice." "But you're the Leader," the girl said in astonishment. "You're entitled to all the Free Choices you want!" He lifted his twitching head, smiling wanly. "It would seem that way, wouldn't it? Well, whether I am or not, I think I've really earned a Free Choice. I wonder," he said in a wistful voice, "whether the climate in the Andes is hospitable."